51 lines
1.4 KiB
Markdown
51 lines
1.4 KiB
Markdown
# JSON_NOEXCEPTION
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```cpp
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#define JSON_NOEXCEPTION
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```
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Exceptions can be switched off by defining the symbol `JSON_NOEXCEPTION`. When defining `JSON_NOEXCEPTION`, `#!cpp try`
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is replaced by `#!cpp if (true)`, `#!cpp catch` is replaced by `#!cpp if (false)`, and `#!cpp throw` is replaced by
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`#!cpp std::abort()`.
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The same effect is achieved by setting the compiler flag `-fno-exceptions`.
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## Default definition
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By default, the macro is not defined.
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```cpp
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#undef JSON_NOEXCEPTION
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```
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## Notes
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The explanatory [`what()`](https://en.cppreference.com/w/cpp/error/exception/what) string of exceptions is not
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available for MSVC if exceptions are disabled, see [#2824](https://github.com/nlohmann/json/discussions/2824).
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## Examples
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??? example
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The code below switches off exceptions in the library.
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```cpp
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#define JSON_NOEXCEPTION 1
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#include <nlohmann/json.hpp>
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...
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```
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## See also
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- [Switch off exceptions](../../home/exceptions.md#switch-off-exceptions) - more information how to switch off
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exceptions
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- [Supported Macros](../../features/macros.md) - guide to all supported macros
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- [Working Without Exceptions](../../features/no_exceptions.md) - using the library without exceptions
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- [Exceptions](../../home/exceptions.md) - all exceptions and their error codes
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- [`exception`](../basic_json/exception.md) - base class of all exceptions thrown by the library
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## Version history
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Added in version 2.1.0.
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